In most web browsers, you can zoom in and out by holding down the Ctrl key (the Cmd key in OS X) and pressing either the "+" or "-" key at the same time.
Another option is to use the mouse: hold down the Ctrl key and move the mouse scroll wheel. To return to normal size, press the Ctrl and 0 keys at the same time.
UDC (Universal Decimal Classification) enables to search by international classification system where literature is grouped by scientific disciplines and the corresponding numerical indexes. UDC index can be searched from the UDC Classification Table.
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